[Octave-bug-tracker] [bug #51068] Incorrect result of random number generator

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?51068>

                 Summary: Incorrect result of random number generator
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 19 May 2017 02:02:23 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Linglin
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Other

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Details:

Hi, I am currently using esponential random number generator and uniform
random generator to do some experinment. However, I found that the histogram I
drawn from the data set genreated is not as expected. 

I will put the result I got in the document. 

For the exponential random number generator, I am using this:

t4_real=mod(exprnd(lambda4,1,2*n),9) + 1 ;

This function is used to generate a exponential random number from range
[1,10]. According to the property of exponential random number generator, the
number "1" should appear more than number "2".  However, it works the other
way around. 

Please let me know why it happens like this.

1. Run expo.m
2. open original.csv
3. Create a new collumn with 0 to 10
4. Select column E
5. Choose "Statistics" -> Descriptive Statistics -> Histogram
6. Using the created collumn as cut off
7. Then you will see the result. 




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File Attachments:


-------------------------------------------------------
Date: Fri 19 May 2017 02:02:23 PM UTC  Name: expo.m  Size: 3kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=40736>

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